We welcome any suggestions or insights you may have.Additionally, if anyone has information on the approximate cost of building a duplex and triplex in California, we would greatly appreciate your input.To provide context, neighboring properties in the area we bought offer insights into the local housing market.

It is better for us to move the tenants out whenever we take over a building that has rents that are way under market.

In the under $400k price point I'd look at Fairfax, Alexandria (not the brick garden buildings, but newer buildings) and Springfield.

Do this for a year or two and build up more cash, and then do it again. 

Beyond that, most self storage only being 8 1/2 foot tall or so wide, a 10 x 30 or 10 x 40 storage unit can't handle RV's and boats.Recreation areas/cheaper land:  The way you beat your competition is to build closer to the Recreation areas or on routes to them, from the populations.

Lol, all jokes aside, that is a crazy request...I would tell them that I have no information on any drug use in the building.

Both are older homes, the 3/3 was renovated in the 80s.2/1 home is prime candidate for a tandem house out back or teardown and convert to Rowhome zoning, (properties were recently rezoned just across the alley tandem homes, ADU already zoned ok) 3/3 is newer, on a double lot, but my thinking is that I could hold these for a while, go through the rezoning process and sell both if/when the neighborhood continues to get hot enough for more density building, possibly work with a contractor friend of mine to get going in this direction, or try to do construction of tandem home behind 2/2 and then adu behind 3/3 home.Are there any resources for spreadsheets or analysis specifically in this realm/that I could show my financiers to calculate the projections on this?

I noticed your link was actually to the previous Chicago Building Code "13B". 

I have acquired my experience from working on my personal live-in-flips and building ADUs, as an owner builder and self-performing most of the work.

With commercial insurance, there are many ways to value a building, structure coverage and set deductibles.